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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ (6,916,714) $ 2,205,950 $ 2,395,300
Change in unrealized gain (loss) on open futures contracts 2,497,914 (6,009,940) 1,996,630
Dividend income 2,766 2,798 4,719
Interest income 3,669 2,288 4,481
ETF transaction fees 6,650 5,600 9,450
Total income (loss) (4,405,715) (3,793,304) 4,410,580
Expenses      
General Partner management fees (Note 3) 118,848 143,944 250,075
Professional fees 101,338 150,833 150,502
Brokerage commissions 6,117 3,918 8,360
Directors' fees and insurance 3,140 6,009 7,620
License fees 2,377 2,879 5,001
Total expenses 231,820 307,583 421,558
Expense waiver (Note 3) (89,122) (128,906) (100,580)
Net expenses 142,698 178,677 320,978
Net income (loss) $ (4,548,413) $ (3,971,981) $ 4,089,602
Net income (loss) per limited partnership share $ (3.97) $ (4.63) $ 1.09
Net income (loss) per weighted average limited partnership share $ (3.48) $ (3.85) $ 2.19
Weighted average limited partnership shares outstanding 1,305,753 1,031,781 1,866,712